Four programs, one calendar, nineteen years of notes.

Six rocky-shore sites between the outer point and the inner cove. Paired volunteers survey each site at a pre-scheduled spring low tide, record species presence against the standard checklist, note water temperature at pools one through three, and photograph a fixed reference frame (the "Bream Frame") so the photo record accumulates year over year.

What we log, every walk: common periwinkles in the fixed quadrat, green crab count in the north ledge, barnacle line height, presence of juvenile mussels, sea-star count if any, water temperature, air temperature, wind, cloud cover, and a free-text "anything else" that is often the most interesting column when you look back.

New Tidepool walkers shadow for a full season before logging independently. Most walks take about ninety minutes, plus a coffee afterward that, historically, takes longer.

Four times a year we walk twelve marked lines across the salt marsh, measuring spartina height at fixed stations, noting fiddler-crab burrow density in Pell-frame quadrats (30 cm square, heavy aluminum, hard to lose), and flagging the inland edge of open water. This last measure — where the grass is losing ground — has become the most watched number in our whole record.

Line seven has been our bellwether for three years running. Line three, by contrast, has been reassuringly boring since 2018, which we take as good news.

Transect walks run longer (half a day) and ask for reasonable fitness and a tolerance for mud. We go in groups of four, with a pot of tea waiting at the end and usually a loaf of someone's bread.

A plain notebook and a pair of binoculars. Volunteers sign up for dawn shifts at three sandbar sites through the migratory season. The entries are short and consistent: date, tide, species, count, weather, remarks. The notebooks are transcribed at season's end by Tomás, who takes over a long kitchen table for a weekend and a kettle for longer.

Ten-year running means are posted in the annual summary. The semipalmated plover arrival date has shifted four days earlier across the record. The least sandpiper count has held steady. The ruddy turnstone count has halved. These are the kinds of things a plain notebook, kept patiently, is good at noticing.

This is the quietest of our programs and the one most often chosen by people who want the company of the coast without the company of other people, at least before breakfast.

Twice a year we host visiting classes from the regional schools on a guided low-tide walk. Volunteers act as pairs-of-hands, not lecturers: a child asks what a thing is, a volunteer helps them look it up in a field guide and write the answer down. The aim is not to teach biology. The aim is to give a child the small, important experience of having asked a careful question about a living thing and written down what they found.

Each child leaves with a handmade single-fold pamphlet we print on the harbormaster's old risograph — four species, four questions, room to draw. We have been printing a version of that pamphlet since 2012. Nobody has thrown one away so far as we know.